import java.util.Scanner;

public class Main8 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        double weight = in.nextDouble();
        double height = in.nextDouble();
        BMICalculator bmiCalculator = new BMICalculator();
        double bmi = bmiCalculator.getBMI(weight, height);
        System.out.println(bmi);
    }
}

/* 请在这里填写答案 */
class BMICalculator {
    public double getBMI(double w, double h) {
        // 在这里实现函数
        double weight = w * 0.45359237;
        double height = h * 0.0254;
        double BMI = weight / (height *height);
        return BMI;
    }

}


